There is an infinite number of common multiples for 7 and 14. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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The least common multiples of 7 and 14 are 14,28 and 42>
As 84 = 14 x 6: All the factors of 14 are common to both, ie the common factors of 14 and 84 are: 1, 2, 7, 14; All the multiples of 84 are common to both 14 and 84, ie the common multiples of 14 and 84 are: 84, 168, 252, 336, 420, 504, 588, 672, 756, 840, ...
Common multiples of 7 and 5 include 35, 70, 140, etc.
Here are some common multiples of 12 and 7 84, 168, 1008 and 12096.
The first 3 multiples of 7 are: 7, 14, and 21.